(stepfunctions): the service does not support JSON paths for MaxConcurrency on a Map state but CDK can generate one

### Describe the bug

Allowing JSON paths for `MaxConcurrency` was added in response to https://github.com/aws/aws-cdk/issues/20152, but JSON paths are not actually supported for the `MaxConcurrency` key in a `Map` state by Step Functions.

### Expected Behavior

I would expect synth to fail in the reproduction example.

### Current Behavior

Synth succeeds, but deploying fails with the following error:

```
11:31:04 AM | CREATE_FAILED | AWS::StepFunctions::StateMachine | StateMachine2E01A3A5
Resource handler returned message: "Invalid State Machine Definition: 'SCHEMA_VALIDATION_FAILED: Expected value of type Integer at /States/Map State/MaxConcurrency'"
```

### Reproduction Steps

```js
import { Duration, Stack, StackProps } from 'aws-cdk-lib';
import * as stepfunctions from 'aws-cdk-lib/aws-stepfunctions';
import { Construct } from 'constructs';

export class SfReproStack extends Stack {
constructor(scope: Construct, id: string, props?: StackProps) {
super(scope, id, props);

const map = new stepfunctions.Map(this, 'Map State', {
maxConcurrency: stepfunctions.JsonPath.numberAt('$.maxConcurrency'),
itemsPath: stepfunctions.JsonPath.stringAt('$.inputForMap'),
});
map.iterator(new stepfunctions.Pass(this, 'Pass State'));

const machine = new stepfunctions.StateMachine(this, "StateMachine", {
definition: map,
stateMachineName: 'ReproStateMachine',
timeout: Duration.minutes(5),
});
}
}
```

### Possible Solution

I think https://github.com/aws/aws-cdk/pull/20279 should be reverted until Step Functions supports this.

### Additional Information/Context

_No response_

### CDK CLI Version

2.28.1 (build d035432)

### Framework Version

_No response_

### Node.js Version

v18.4.0

### OS

macOS 12.3.1

### Language

Typescript

### Language Version

_No response_

### Other information

_No response_

Start with the TypeScript reproduction using Map.maxConcurrency and JsonPath.numberAt, then inspect the change from pull request 20279. Run synth for the example and verify that it rejects a JSON path for MaxConcurrency instead of producing a state machine definition that fails during deployment.

Written by the indexing model from the issue text.